Fixing bugs in my game on xcode 7 macbook air

Hey guys, so in my last video I

thought that I fixed the problem, but it

wasn't actually fixed because I kind of

broke it last time. Last time all I did

was I deleted this to stop the monster

from moving, so that's why the orange

block will stop moving as well, but the

monster didn't come down the screen like

it's supposed to. But now I've

found out how to fix it. Hold on, I'll

Ugh, it takes ages to open this. Okay, so

as you can see, I've shot it right now.

Before, it did this as well, but if I shot

it again, the monster was still there. I

had just set monster.hidden to yes. So you

couldn't see it, but it was still there.

So if you kept shooting— why are these

dying?

Now these are dying for some reason.

So if I shoot this block again, it should

And that was just because I added this

tiny bit here: monster3.hit equals no.

Now monster, monster hit makes

it so that after the monster has been hit

once, if you— even if it gets hit again,

nothing will happen to it afterwards.

And that was— it's a boolean,

and we have an integer monsters killed.

Uh, hold on, something's strange.

So we've set monsterHidden to yes, so if

we set it to no, we can actually see

We can see that. So it's being hit,

and then this orange block appears where

it last was, where,

where the monster last was. So even if we

shoot it again, nothing will happen

because we put monster hit in equals no.

So if we put monsterHit equals yes, let's

see what happens.

So if we put yes, the orange block doesn't

appear. And if we

get rid of it entirely,

If we get rid of monsterHit, it would work

the same, but if you hit it again, the

orange block keeps respawning where the

monster was last hit, so that's no good.

Because we might still be shooting, we

might accidentally shoot the hidden

monster, and then his corpse would

reappear. It's kind of strange. But now I

have monsterHit in as no,

it's all working. And I'm not really sure

why, because there's no monsterHit code.

We have movement

There is— once it's set to

no when the game starts,

uh, where is it? What's this movement?

So I've also got— where's

monster3? Monster3 is here. There's

nothing in the if statement. I don't know

if these— this code is actually doing

anything. Okay, let's just delete it

all, see what happens.

Okay, so if I delete all that,

the zombies stop appearing— reappearing at

the top after they've been shot.

Interesting. Okay, let's put that code

Where is Monster 3?

So if we put this code in back into

Monster 3, so when it gets shot, it should

randomly appear at the top, but then the

orange block is also going to randomly,

randomly appear at the top.

Let's try it out.

Strange, it's not reappearing at the top.

Hmm, so it seems like I have to make a

choice. I can either have them die once

appear as a block, or I can have them die

like this, just disappear, and then

reappear at the top. I kind of like the

first one better because it's more

realistic if it leaves a corpse after

you've destroyed it.

So where did it go?

So let's try out on the second monster,

because so far the orange block only

appears on one monster. Let's try out this

one. Make him bigger so we know where he

is. He is monster 14,

and we need a second orange block.

Whoops.

And we shall make

him monster 14 dead.

Okay, just change this to 14,

and then what

else do we need? We need to

link it up.

Monster 14 dead, like this.

And then we copy and paste— where

is it? Monster 3 frame— this

one? No,

we copy and paste this one inside.

Find— get rid of this. Okay, let's see if

Oh no, I didn't set it to hidden.

Okay, hold on.

Oh yeah, it needs to go to view did load.

Monster 14 dead, hidden.

And then And

get rid of this because it isn't really

doing anything.

Monster 3, put it frame.

Monster 4, Monster 4. Okay, this should be

changed to 14. No, yeah,

14 and 14. Wait, we did it on 14.

This is number 4. Oh, for God's sake.

Uh, what should we do?

Um, okay, just get rid of this.

Let's find 14. 14 was down here,

right? I think it

should work. No, Monster 14.

And yeah, okay, should be fine now.

Okay, so that leaves an orange block. But

where's the orange block? Okay, it's

reappearing up there. That— so the orange

block might be off the screen, so we need

to stop it from reappearing. At the top.

Where is the 14? Here you are. So get rid

of this.

The moment of truth. We got orange block

and we got an orange block. See?

And if we shoot it again, the orange block

stays there. So that's perfect. So all we

need now is more monsters and maybe make

them walk a bit faster.

So at the end of the level, you just have

this field full of dead zombies,

and then that would be like level 1

finished. And then I'll have the next

wave, and the next wave will be even more

And I could have— oh, I know what we

can do. Let's have it so when it touches

the tank, it dies. So it's like being run

over. Okay,

so it will just be the same code as this,

but instead of bullet frame, it will be

the Is it ship frame?

Yeah, let's run.

So funny because in the last video I

thought I fixed the problem, but I didn't,

and then I realized what happened after

the video. So let's see what happens when

you run it over. It should just be an

orange block on the tracks.

Okay. Oh, there we— oh, if it touches the

front— wait, why did that just die? We

didn't even shoot it.

Ah, damn it. There's always strange

problems that happen and it takes time to

find out why.

So where's 14?

14, 14, 14, 14,

14, 14, 14.

Let's try it again.

Now if I take the tank out of you.

No one should be dying.

No one's dying. No one's dying.

It died, and that one just died as well.

Why? The tank's

all the way over here. Ah,

let's see if it happens every time.

Okay, so when it gets to this track, for

some reason it's just randomly dying.

Well, it's not random, it happens every

Oh, it didn't happen this time.

This time it hasn't happened. Okay, so

that's really strange,

but that was because we shot the cannon at

the beginning. If we don't shoot at the

beginning, things kind of go strange.

Watch. Okay, I'm not gonna shoot, I'm not

gonna shoot, and we'll see what happens.

I bet it dies on the track.

Watch, watch. See, if I don't shoot at the

beginning, they die. If I shoot at the

beginning, they don't die.

I think the animation is messing things up

because I have like an animation set up.

When you fire the cannon, it kind of

recoils. So let's

get rid of the animation. And we'll try it

I bet it does not die.

It did. Oh, it did die. So it's not the

animation. So no, that's really

strange. So if I shoot at the

beginning, everything's okay. But if I

don't shoot and let them come towards me,

they just die on the tracks.

So this is the shoot— no, this is the

start button.

Where's the shoot button?

This is for the movement of the tank.

Oh, here's the shoot. So if

bulletsOnScreen equals 0, bullets is no,

hidden no.

bullet.center equals CG.

Shouldn't this be Shouldn't

this be shipCenter.y,

not 7y?

What happens then?

See if he dies if he touches me.

He's not dying. And he died.

Okay, this time we shall— we won't shoot

first and we'll let them come towards us.

And see if they die,

because then we can find out what's

messing stuff up.

Are they

dying? Yeah, they're still dying,

so that wasn't the reason. Hmm.

Not really sure.

Monster killed. So if monsters killed plus

1— no, monsters killed equals monsters

killed plus 1. BulletsOnScreen equals 0.

Bullet.Hidden equals yes.

BulletMovement equals 0.

Bullet.Center equals— so where this

is, I'm not sure. So if I put no,

we can find out where the bullet is.

Reappearing. Okay, so the Buddha is

reappearing here.

Okay, now the Buddha's gone.

Oh,

oh, I get it. So when

before we were shooting and we were

hitting another monster and then the

bullet was appearing here for no reason—

look, watch. What?

It's not— wait,

see, the bullet's there. So it's touching.

We need to stop it from appearing here,

so we can get rid of this and we can put—

make it appear at the ship.

ship.center.y. See what happens

now, see where it appears.

Okay, so it's appearing on the tank,

but it only appears on the tank if I hit

those 2. If I hit any others, they don't

reappear.

And the reason why— because it was on put

it hidden yes at start. If I put this to

no, then we'll see that the bullet was

where those monsters were dying.

Watch this. See, the bullet is there now,

but before it was like here. That's why

So we need to put the bullet somewhere

where these monsters aren't going to

touch.

See, it's just going to die. When it

touches, and then it reappears here on the

So we need a safe place for the bullet to

reappear. So let's

put it like a crazy number.

Where is it?

Here it is. So we can put it like a crazy

number.

Like 1,000,

so it's miles away from the screen. What

failed? Is it plus? Plus 1,000.

There we go.

But it's still there at the bottom.

Okay, I know. We can do at the start of

the game, at the start of the game,

bullet.center equals CGPoint.make

ship.center.x,

ship.center.y plus 1000.

Now it shouldn't be at the bottom Oh, oh,

now what? Oh right, we forgot the

semicolon. Must not forget

your semicolon. See, it's not there.

Okay, so we fixed that problem. And these

are dying. Seems okay.

Okay, that's the end of the video. Thanks

for watching!